As for using the carbon to curb their growth, I didn't think it helps.any. I have two colonies of these purple cloves. They are growing great. I run two 2 little fishies 150 reactors half full of carbon 24/7 on 300 gls. It does not seem to impediments their growth. I plan to control their growth with Kalk paste as I do for just about any other coral.
Shut off all pumps, cover with thick paste. Let stand for 30 mins to an hour. Siphon off Kalk paste and restart pumps. Coral, dead....
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